It would do you good to look at all other BMW deals on here so you can learn all of the numbers that you’re missing and also get to know what makes a good and a bad deal. Currently, you’ve got a pretty shit deal. Here’s something else to read: BMW Leasing Wiki
Lastly, if you want to skip to a decent deal, just go to the broker’s forum and pay one about $400 fee to get you a much better deal.